使用Dom4j读取指定文件，并写入指定文件

导入dom4j的包，然后写入代码如下




package com.dom4j.cn;

import java.io.FileOutputStream;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

public class ChangeXML {
    /**
     * 把文件读取并且写到指定文件中
     * @throws Exception
     */
    @Test
    public void  changeXML() throws Exception {
            Document document = new SAXReader().read("./src/test.xml");
            //修改属性id
            document.getRootElement().element("shaoxin").attribute("id").setValue("003");
            //删除属性id为002的节点
            Element element =(Element) document.getRootElement().elements().get(1);
            element.detach();
            
            FileOutputStream fileOutputStream = new FileOutputStream("C:/Users/shaoxin/Desktop/a.xml");
            OutputFormat outputFormat = new OutputFormat().createPrettyPrint();
            XMLWriter xmlWriter = new XMLWriter(fileOutputStream,outputFormat);
            outputFormat.setEncoding("utf-8");
            xmlWriter.write(document);
            fileOutputStream.close();
            
    }

}

package com.dom4j.cn;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

public class Dom_ChangeXML {
    /**
     * 创建各个节点并且保存在指定文件中
     */
    @Test
    public void changeXML() {
        Document document = DocumentHelper.createDocument();
        Element rootElement = document.addElement("people");
        Element shaoxin = rootElement.addElement("shaoxin");
        Element age = shaoxin.addElement("age");
        Element name = shaoxin.addElement("name");
        shaoxin.addAttribute("id", "001");
        age.addText("21");
        name.addText("邵欣");
        FileOutputStream fileOutputStream;
        try {
            fileOutputStream = new FileOutputStream("C:/Users/shaoxin/Desktop/a.xml");
            OutputFormat outputFormat = new OutputFormat().createPrettyPrint();
            outputFormat.setEncoding("utf-8");
            XMLWriter xmlWriter = new XMLWriter(fileOutputStream, outputFormat);
            xmlWriter.write(document);
            fileOutputStream.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        
    }

}

package com.dom4j.cn;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.SAXReader;

public class Dom_XML {
    /**
     * 输出文件中所有的节点名称
     * @param args
     */
        public static void main(String[] args) {
            SAXReader saxReader = new SAXReader();
            try {
                Document document = saxReader.read(new File("./src/test.xml"));
                Element element = document.getRootElement();
                sax(element);
                
            } catch (DocumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        public static void sax(Element element) {
            System.out.println(element.getName());
            Iterator<Node> node = element.nodeIterator();
            while(node.hasNext()){
                Node node2 = node.next();
                if (node2 instanceof Element) {
                    Element  element2 = (Element) node2;
                    sax(element2);
                }
            }
        }
}